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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdf7fe9ed2319d7c4ec302173ea4d75567d8f0d2b58b296780df2b0ca5e496af' 
  AND token = 'pnpXImiO6bFAC6YTW6t4A3LtZaxsHRntjMn3cd0FXeI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}